造纸法烟草薄片碳化硅膜净化系统清洗工艺研究OA北大核心CSTPCD

The composition of reconstituted tobacco sheet recycled extract was analyzed,the appropriate inorganic acid cleaning agent of sili-con carbide membrane purification system for recycled extract purification was screened and determined in this study.The cleaning effect of the inorganic acid cleaning agent at different concentrations were studied.The combination of inorganic acid cleaning agent and alkaline clean-ing agent were optimized.A chemical soaking process based on the original cleaning process was added,and the appropriate chemical soak-ing process was preferentially determined through the comparison of the two types of chemical soaking process.The results showed that:①there was about 75％of the organic matter in the reconstituted tobacco sheet recycling extract;② after cleaning by NH2SO3H solution with mass fraction of 10％,membrane flux of membrane purification system on production line recovered to 86.05％of the original flux to meet the membrane purification system cleaning needs;③ the better detergent combination was of NH2SO3H solution with mass fraction of 6％and NaOH solution with mass fraction of 6％;④ the suitable chemical soaking process conditions were that NaOH solution with mass fraction of 10％,started lye pump every 4 h with running for 1 h,chemical immersion total time for 24 h.After optimization,the operating cycle of the membrane purification system of reconstituted tobacco sheet production line was increased to 14.0 h,and the membrane flux recovery ratio was increased to 94.00％,and the daily chemical cleaning consumption time was reduced to 89 min.